The previous owner of my car converted the headlight housings/bulbs & is currently running H3s on it. I'm contemplating ordering Depo headlights but was wondering if switching out the bulbs for this swap is just plugging the new bulbs into the wiring harness or if it's something that goes further than that. Any help is appreciated

 

the Depos should come with the bulbs, wiring and everything to bolt into the stock harness. so as long as you still have the OEM connectors, you are good.